Galena and Alexandrite Physical Properties

Galena

Alexandrite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

6.233.69-3.81

1 7.18

1.5 Fracture

Subconchoidal, Brittle, Metallic

Not Available

1.6 Cleavage

Cubic perfect on [001], parting on [111]

1,1 ; 3,2.

1.7 Mohs Hardness

2.5-2.758.5

2 10

1.8 Chemical Composition

PbS

BeAl ₂ O ₄

Galena and Alexandrite Chemical Formula

While comparing Galena and Alexandrite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Galena and Alexandrite chemical formula.

Chemical formula of Galena- PbS
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Galena and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Galena and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Galena and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Galena is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.